CVE-2015-7513: Canonical Ubuntu Linux

Medium severity, CVSS 6.5. EPSS: 0.6% chance of exploitation in the next 30 days.

arch/x86/kvm/x86.c in the Linux kernel before 4.4 does not reset the PIT counter values during state restoration, which allows guest OS users to cause a denial of service (divide-by-zero error and host OS crash) via a zero value, related to the kvm_vm_ioctl_set_pit and kvm_vm_ioctl_set_pit2 functions.

Affected products

• Canonical Ubuntu Linux: version 12.04 only; version 14.04 only; version 15.04 only; version 15.10 only
• Debian Debian Linux: version 7.0 only; version 8.0 only
• Fedoraproject Fedora: version 22 only; version 23 only
• Linux Linux Kernel: before 4.4 (fixed in 4.4); version 4.4 only

Published 2016-02-08. Last modified 2026-06-17.